Heat exchanger



June 11, 1946. o. RASMUSSEN HEAT EXCHANGER Filed Dec. 27, 1943 INVENTOR04 "IF Qflsmussf/v B J *2 M5 m 0 ATTORNEYS Patented June ll, 194$ 1 HEATEXCHANGER Olaf Rasmussen, Dayton, Ohio, assignor to General MotorsCorporation, Detroit, Mich., a corporation of Delaware ApplicationDecember 27, 1943, Serial No. 515,734

1 Claim. (Cl. 210150.5)

This invention relates to heat transfer apparatus and is particularlyconcerned with a combination heat transfer device and filter.

An object of the invention is to provide a heat transfer device incombination with a filter 5 24 and 26 are spaced by means of two sideporwherein, due to the peculiar nature of the filtertions or rails 28and 30 which assembly forms a ing medium, the effective area of the heattransframe open at both sides thereof. fer surface is greatly increased.The frame, formed by the two side rails 28 and Another object of theinvention is to provide 30 of the headers 24 and 26, together with thean oil cooler and filter wherein water or other in attached tubes isthen preferably placed on a cooling medium may be circulated through agraphite plate and metal powder is poured plurality of conduits such as,tubes which are around the tubes and into the frame which concarried byand bonded to a porous metal block fines the powder. Sufficient metalpowder is through which oil may be passed, whereby the used tocompletely fill the frame and surround oil is filtered arc. herebycleaned of extraneous is all of the tubes and cover the upper mosttherematerial and si....1taneously cooled. of, after which the framewith the metal powder A further object is to provide a plurality oftherein is preferably vibrated to settle the pewtubes which may beutilized to carry one fluid der, whereupon additional powder is addeduntil and to embed these tube in a block of porous a completely fullframe is obtained. Metal pow- :metal through which another fluid may beso ders such as a mixture f copper and ti powpassed, whereby thetemperatures of the fluids der in portions of 90 parts copper and partspassing through the two conducting mediums tin. or a pre-alloyedcopper-tin powder wheretends to become equalized. in. the tin coats thecopper in the same propor- Further objects and advantages of the presenttions may be used. The graphite plate with the invention will beapparent from the following filled metal frame thereon. is then placedin a description, reference being had to the accomsintering furnacewhere it is heated under non panying drawing wherein preferredembodiments oxidizing conditions to a temperature above the of thepresent invention are clearly shown. melting point of tin and below themelting point In the drawing: of copper preferably in the neighborhoodof from Fig. 1 is a sectional view through one em- 1600 to 1925 F. for aperiod ranging from 15 bodiment of the invention taken on line il ofminutes to an hour. Under these temperature Fig. 5. conditions, the tinalloys with the copper and Fig. 2 is a partial fragmentary end view offorms a highly porous bronze block which is the element shown in Fig. 5.integrally bonded to the frame and is likewise Fig. 3 is a sectionalview taken on line 3-4 of bonded to the tubes in intimate heat transferFig. l. relation thereto. The entire assembly is then Fig. 4 is an endview of the device shown in cooled under non-oindizing conditions toform Fig. 5 wherein one of the header connections a block of porousmetal having a plurality of has been removed to show the filter blockand copper tubes extending therethrough. tubular radiator therein and Tothis block, two side plate members 32 and Fig. 5 is a. side view of acomplete device. 34 are assembled which have central apertures Thisinvention is particularly adapted to cool- 36 and 38 in the form ofconnections which may ing devices wherein simultaneous filtering of bethreaded for the attachment of pipes or may the medium to be cooled isdesired. One emhave tubes clamped thereto .if desired. Plate bodiment ofthe invention is particularly adaptmembers 40 and 42 may be assembled tothe ed for an oil cooler and filter for use in connecother two sides ofthe block which members have tion with internal combustion engines. Oneof flanged portions 44 and 46 thereon that hold such combined coolersand filter is shown in the members 32 and 34 in position, The memsectionin Fig. 1. This unit as shown is for bers 40 and 42 also have centralapertures thereillustrative purposes only since it is apparent 60through in the form of connections 48 and 50. that many variations andembodiments of the The assembly is nekt soldered or welded around samebasic invention may be utilized. The unit and flanges 44 and 46 andalong all other open consists of a main body portion 20 that includesJoints to form a hermetically sealed unit to a. plurality of tubes 22preferably copper, which which access can be gained only through the mayhave any cross section desired. These connections ,36 and 38 or 48 and50.

tubes, spaced in the desired relation to one another, are held between apair of spaced headers 24 and 28 to which they are brazed or welded orotherwise hermetically secured. The headers gsomw is obteined whichprovides excellent conduction between the filter block and the coolingmedium. While the description herein has been limited for my desiredpurpose. Likewise any other hsve in the filter block. The sinteringtemperstures are well-known in the srt as ere alloy types of powders.The descriptions of various silo! powders will be found in Olt Patent2,273,589. Oombinstions 0! metal powder used to mske filtering ormetering elements may be noted in Koehring Patent 2,198,702. Both of theforegoing petents ere assigned to the assignee of the present invention.

4 AisothetubesflmrbeoisnydesiredmsterisliorexsmplehistesdorcoppenthehihesmybeItsinle-lteeLmlIn-Jlmelmetfl etc. when diiierent porosities clfiltering inedizoflmmeehpowderyieldsverysstisisctory ts.Itistobeunderstoodthstthespecifieembodimentortheinventionmsybevsried-indssigntomeettherequiredneedsoilnysnviicetionwhereinsimultsneouscoolingsndfiltering likewisethequsntityoiporousmetslmsybereguleiodlothstthesm'hceereslnrelntimtothesresoithetuhulsrductsprovidesthedosiredthermslefiectsinconneetionwiththequsntityoifiuidsbeingpessedthroughthedevice.

likewise the device may be used es s best trsnsier medium only, whenfiltering is not de- 45 through said porous metal block.

OLA! RABHUSBIN.

